We all know how to do blue walls with white trim. Now what about some more intriguing color combinations, like eggplant and pale green? Here's what designers recommend.

Red-on-Red

Red-on-Red

"For a red-on-red library, I chose a vibrant Chinese red in high gloss and painted the walls about six times, to get real depth. Then I used a slightly browner red on the moldings to create a shadow line and add a little contrast. The combination is bold and intense, but oddly enough it's a very relaxing room. The red just pulls you in." –William Eubanks

Gray & Mahogany

Gray & Mahogany

"Parma Gray is a soft, soothing blue that feels like the ocean and the sky — an unexpected choice in a library. It doesn't come across as baby blue because there's so much gray in it. I didn't want to paint the moldings the usual black or white but it still needed a nice contrast, and came up with chocolate brown — like earth against the sky. It grounds the room and picks up the tones of the dark wood furniture." –Scott Sanders